adding more nodes

docs/nodes/Wrap Value.md

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+# Wrap Value
+
+Rewrap periodic values in a DATA_FIELD to a specified angular or custom range. Commonly used for phase images where values should lie within a well-defined interval. Equivalent to Gwyddion's `wrapvalue.c` module.
+
+## Inputs
+
+| Name | Type | Required | Description |
+|------|------|----------|-------------|
+| field | DATA_FIELD | Yes | Input field with periodic values to wrap |
+
+## Outputs
+
+| Name | Type | Description |
+|------|------|-------------|
+| wrapped | DATA_FIELD | Field with values wrapped to the target range |
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| preset | dropdown | 0-360 | Wrapping range preset: 0-360 (degrees), pm180 (±180°), 0-2pi (radians), pm_pi (±π), or custom |
+| custom_min | FLOAT | 0.0 | Lower bound of the wrapping range (used only when preset is custom) |
+| custom_max | FLOAT | 360.0 | Upper bound of the wrapping range (used only when preset is custom) |
+
+## Notes
+
+- Preset ranges: 0-360 wraps to [0, 360], pm180 wraps to [-180, 180], 0-2pi wraps to [0, 2π], pm_pi wraps to [-π, π].
+- custom_min and custom_max are ignored unless preset is set to custom.
+- This node applies modular arithmetic so that all output values fall within the chosen interval. It does not scale or rescale values.
+- Particularly useful for MFM phase channels, Kelvin probe contact potential images, and interferometric phase maps.